// Copyright (c) Appeon. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

using System;
using Antlr4.Runtime.Tree;

namespace SnapObjects.Expressions
{
    internal class PrimaryExpressionVisitor<T, TContext> :
        NodeExpressionVisitor<T, TContext> where TContext : IParseTree
    {
        public PrimaryExpressionVisitor(IServiceProvider services) : base(services)
        {
        }

        public override T Visit(
            IExpressionVisitor<T> treeVisitor,
            TContext context,
            ParserOptions<T> options)
        {
            var childIndex = 0;

            if (context.ChildCount > 0)
            {
                if (context.ChildCount > 1)
                {
                    childIndex = 1;
                }

                var child = context.GetChild(childIndex);

                return treeVisitor.Visit(child, options);
            }

            return default;
        }
    }
}
